Louis!!!

My sister was on the computer with a friend choosing a graduation invitation. She had to email a picture to the friend and while waiting for it to send a Louie Armstrong song started playing. My sister seemed to switch her voice from her mouth to her throat and started singing in voice not unlike a horse muppet. She spontaneously would sing a line of Louis every few minuets and then keep doing whatever she was doing before. Finally she started singing and then coughed and choked a little. Smiling sheepishly she stopped singing.